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Oppo PM-1: A New Planar Magnetic Headphone! - Page 110

post #1636 of 2487
Quote:
Originally Posted by Clemmaster View Post

According to this document, the X-curve is used to translate what the sound engineer hears in his near-field setup to the expected result in a larger theater room. It is not an equalization or band-pass filtering, it is a calibration curve.

The mixing stages for feature films at Parmount that I've been in are the size of mall theaters. They don't use nearfield monitors. It's a full theatrical sound installation. Maybe some places work differently.
post #1637 of 2487
Quote:
Originally Posted by Dr AIX View Post
 

As a person that works professionally in sound, I was surprised to learn the the X-Curve is still the "law of the land" when it comes to outputting DCP or final film sound. The article may have been written some years in the past, but that doesn't mean that the standard has changed. It hasn't. Every dub stage in Hollywood mixes and outputs the soundtrack using the X-Curve. And that curve does indeed, rolloff the high frequency information above 10 kHz by 6 dB per octave (although it does vary slightly for smaller spaces). You can read Tomlinson Holman's article on the  history of the X-Curve or check out a pdf on the topic at http://www.hps4000.com/pages/special/Dolby_The%20X-Curve.pdf.

 

The fact remains that high-resolution audio isn't happening at the movies. The idea behind the X-Curve was to provide interchangeability and consistency from production to playback. It seems it has accomplished that goal and no one that I'm in touch with is advocating for anything else.

Which explains the loss of top-end harmonics in the source material for multichannel-audio reviews.  Obviously, neither Oppo® nor any other audio-hardware manufacturer can get past a multichannel-audio mastering standard posted by the Society of Motion Picture and Television Engineers (was this confirmed by the Academy of Motion Picture Arts and Sciences, as Dr. AIX reckons the case to be?), so the PM-1's demonstrated performance is apparently adequate for this specific situation.

 

I actually like to do my own music and may be better able to audition the PM-1 with my own recordings, rather than commercial tracks rolled off at the Nyquist frequencies thereof (meaning 16max kHz, given a 48max kHz sample rate); many of the best sound cards and chips can handle a sample frequency of 192 kHz, meaning a Nyquist frequency of 64 kHz - enough treble headroom for an accurate audition of a new headphone or speaker.

post #1638 of 2487
Auditioning the inaudible.
post #1639 of 2487
Quote:
Originally Posted by bcschmerker4 View Post
 

I actually like to do my own music and may be better able to audition the PM-1 with my own recordings, rather than commercial tracks rolled off at the Nyquist frequencies thereof (meaning 16max kHz, given a 48max kHz sample rate); many of the best sound cards and chips can handle a sample frequency of 192 kHz, meaning a Nyquist frequency of 64 kHz - enough treble headroom for an accurate audition of a new headphone or speaker.

 

Nyquist frequency is half the sampling rate so that would be 24kHz for 48kHz. Good luck trying to hear that.

post #1640 of 2487

Topic -- before we are derailed again. :wink: 

post #1641 of 2487

What about the PM-2? Does anybody know if they will share the same sound signature?
I think I can live without the box and the stand.
https://www.oppodigital.com/future/PM-2_Planar_Magnetic_Headphones.aspx

post #1642 of 2487
Quote:
Originally Posted by squallkiercosa View Post
 

What about the PM-2? Does anybody know if they will share the same sound signature?
I think I can live without the box and the stand.
https://www.oppodigital.com/future/PM-2_Planar_Magnetic_Headphones.aspx

 

I'd like to know if they come with velour pads because I'm not a fan of pleather.

post #1643 of 2487
They come with both types of pads. They're very easy to swap out too.
post #1644 of 2487
Quote:
Originally Posted by bigshot View Post

They come with both types of pads. They're very easy to swap out too.

 

It is confirmed the PM-2 does?  I know the PM-1 does, but what else will be the cost savings of the PM-2?

post #1645 of 2487
Quote:
Originally Posted by hodgjy View Post
 

 

It is confirmed the PM-2 does?  I know the PM-1 does, but what else will be the cost savings of the PM-2?

Most likely there'll be some inevitable sonic degradation, how much we won't know 'till the PM-2 hits the shelf.

post #1646 of 2487
In the beta test, one of the folks from Oppo mentioned that certain parts of the frame of the headphones were very expensive to machine. In one of the Betas they sent me, some parts in the cup pivot were made of plastic instead of metal. It may be that they save money on things like that with the PM-2s.
post #1647 of 2487
Quote:
Originally Posted by bigshot View Post

They come with both types of pads. They're very easy to swap out too.

 

I thought the PM-2 would only ship with one set of pads - the synthetic ones that look exactly like the lambskin until you inspect them closely and discover they lack the grain (and smell) of the the leather pads.  

 

The three types of pads are all interchangeable between the PM-1 and PM-2.  

 

It's all subject to change, however, so please take my current understanding with a grain of salt.  

post #1648 of 2487
Haven't seen the PM-2s. Everything about them is speculation. I'd imagine that you could buy velour pads from Oppo if they don't come with them though.
post #1649 of 2487

Just finished my PM-1 Review.

post #1650 of 2487

Review by Secrets of Home Theater and High Fidelity out

OPPO PM-1 Planar Magnetic Over-the-Ear Headphones

Written by John E. Johnson, Jr.

Published on 21 April 2014

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